What mordal verb suits in here:
tut mirlied, da ich auch nicht. ich arbeite morgen den ganzen tag.
and what does 'tut mirlied' mean?

The modal verb 'kann' fits, so the sentence is

Tut mir Leid, da kann ich auch nicht. Ich arbeite morgen den ganzen Tag.

Explanation:

The sentence then means:

I'm sorry (this is what Tut mir Leid means), I can't at that time either. I will be working the entire day tomorrow.

answer:

because the gravitational attraction of our sun for the earth is the centripetal force causing the earth's circular motion around the sun, we can use netwon's law of universal gravitation to find the mass of the sun without ever actually visiting the sun. this is the same technique you would use to determine the mass of cygnus x-1 with a probe. the earth, orbiting the sun, plays the same role as the probe sent to orbit cygnus x-1.

f(force of gravity) = f(centripetal force)

explanation:

hello i am m